Irreplaceable

Apple has been one of the world's most innovative companies, revolutionizing our lives -- and charging a premium to do it. Now, its stock has been on a six-month downward run, and understanding the real reason why might help guide your other investment choices.

Mild panic swept through Berkshire Hathaway's shareholders Tuesday after Warren Buffet announced he had prostate cancer. But the panic was brief, and not just because the disease isn't life threatening.